KEY BISCAYNE, Fla. — Johanna Konta lofted a lob off the baseline for a winner on championship point, waited for instant replay to confirm the call and even then hesitated to celebrate the biggest title of her 11-year career.

“To be honest, I actually couldn’t kind of believe it was over,” she said.

Seeded 10th, Konta was an unlikely champion, but the Australian-born Briton beat Caroline Wozniacki 6-4, 6-3 in Saturday’s final at the Miami Open.

Konta, a late bloomer at 25, improved to 19-3 this year and will climb to a career-high No. 7 this week. She was the first British woman to reach a Key Biscayne final, a tournament she was unable to qualify for just two years ago.

“On paper it looks like a quick turnaround,” she said. “But it definitely has been a lot of years and a long time coming.”

Konta received $1.18 million. Her other titles came at Sydney this year and Stanford in 2016.